RingZer0-43

Web Warning - Headache

Hint

The hint tells us that the answer is closer than you think!
What gave it away was the word headache, is similar to “head”er
You only need to at the header of the response that the webpage gives us.

We can use burp to serve as a proxy between us and the server.
In my screenshot i’m using the repeater to send the request and look at the header.

The flag is : FLAG-365m4fU5p2DVEQbfrptDE5Ru